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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
 
 
June 30, 2013
 
December 31, 2012
 
(In thousands)
Proved oil and gas properties (1)
$
2,608,460

 
$
2,271,711

Less: Accumulated depreciation, depletion, amortization and impairment
(498,007
)
 
(383,564
)
Proved oil and gas properties, net (2)
2,110,453

 
1,888,147

Unproved oil and gas properties
67,442

 
76,417

Total oil and gas properties, net
2,177,895

 
1,964,564

Other property and equipment
144,518

 
49,732

Less: Accumulated depreciation
(16,560
)
 
(7,696
)
Other property and equipment, net (2)
127,958

 
42,036

Total property, plant and equipment, net
$
2,305,853

 
$
2,006,600

 __________________
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $26.3 million and $20.7 million at June 30, 2013 and December 31, 2012, respectively.